Apparatus for printing from a negative sound record to a positive



March 7, 1 933. I SPONABLE 1,900,853

APPARATUS FOR PRINTING FROM A NEGATIVE SOUND RECORD TO A POSITIVE FiledMay 15, 1929 2 Sheets-Sheet l mTN 88 I i I d o M By 'flrraR cvs.

March 7,1933. I H S PONABLE 1,900,853

APPARATUS FOR PRINTING FROM A NEGATIVE SOUND RECORD TO A POSITIVE FiledMay 15, 1923 2 Sheets- Sheet .2

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UNITED STATES PATENT OFFICE m1. 1. sroiunm, or new max, is. nassmnon recan oonrom'nom 01 NEW YORK, N. Y., A CORPORATION OF YORK APPARATUS FORIBINTING IROK.A NEGATIVE SOUKD'BECOBD TO A POBI'IIVI Application filedKay 15,

This invention relates to certain new and useful improvements inapparatus for printing from a negative sound record to apositive. a

I have discovered that a more accurate and sharply defined sound recordis produced on the positive with practical absence of overlapping if therays of light used for printing are normal to the record elements. Thismay perhaps preferably be effected by using a line source of lightproduced in any suitable way and combined with a suitable lens or lenssystem for causin the rays of light to pass through the usuaf printingslit in a direction: perpendicular to the record elements.

Other objects and-advantages relate to the.

details of the structure and the form and relation of the parts thereof,all as will more fully appear from the following description taken inconnection with the accompanying drawings, in which:

Figure 1 is a diagrammatic illustration of an apparatus of thisinvention.

Figure 2 illustrates a suitable source-of a line of light.

Figures 3, 4 and 5 illustrate a modified and perhaps preferred form ofapparatus.

The apparatus as shown comprises a gate consisting in this instance oftwo plates 1 and 2 which may be positioned in any suitable well knownmanner to permit the passage between them of a negative record element 3and a positive4in overlying relation. One of the plates of the gate, asplate 2, has a slit 5 formed therein of suitable width and length throuh which slit the negative 3 is exposed to light rays to therebyreproduce upon the positlve a sound record element capable ofreproducing the original sound recorded on the negative.

In effect the record upon the positive con-- I sists of accurate shadowsof the lines on the ne ative.

11 order to produce on the positive accurate shadows of the lines on thenegative, there is utilized a line source of light 5 produced in anysuitable manner, as, for instance, by a lamp 6 having a straight line.filament 7, the filament extending substantially parallel elements.

1029. Serial No. 383,284.

from the straight line .fila'ment 7 is passe through a lens 8 or asuitable lens system for causing the rays of light to extend fromthelens 8 in a direction normal to the negative 3 at the area where the neative moves a'st the slot-5. The result is t at lines of, light areperpendicular to the negative and act therefore, to roduce on thepositive accurate shadows'of t e lines on the ne ative without anyspreading oroverla pin whereby an accurate reproduction of t e soundrecord on the negative can be made upon the positive, and from which anaccurate reproduction of the original sounds can be efiected.

Figure 3 illustrates another means of printing, utilizin light raysnormal to the record he lam 16 furnishes the source of light. Light romthis lamp passes through a narrow elongated slit in the wall 15. Thisbeam. of light enters lens 14 and is broughtto a focus at the centerline of the shaft supporting sprocket wheel 11. Diverging at this point,the light beam impinges on negative 9 which roduces on positive 10 asound record capable of accurately reproducing the ori 'nal soundrecorded on the negative. In this method the light ra s v are alwaysnormal to the negative at t e points of exposure thereby insuring sharpand accurate shadows of the lines of the negative on the positive.

Figure 4 shows further details of the means illustrated in Figure 3. Inorder to allow the light beam to pass through'the sprocket drum 18, thedrum is separated as shown. One section of the sprocket may be driventhrough a worm wheel drive 17 and the other section may be similarlydriven or, as shown, the

' normal to its surface at 26. Here again the elements of the negative23 are re roduced 'on the positive 24 with a highegree of exactness.

The essential feature of this invention cpnsists in causing the rays oflight for eflectmg the printing to extend in a direction normal to thenegative, and in addition the combinato the same, as various changesand'modifications ma be made within the scope of the appende claims.

I claim:

1. An apparatus for printing from a negative sound record to apositivecomprising spaced coaxial sprocket wheel sections over which'thenegative and positive movein an 4 overlying relation, means for focusinga line of light on a portion of said film exposed through the spacebetween said sprocket sections with the rays of light substantiallynormal to the direction of movement of the film at the exposed line.

' 2. An apparatus forv printing from a negativesound record to apositive comprising two spaced co-axial sprocket wheel sections overwhich the'negative and positive move in an overlving relation, means fordriving one of said sprocket wheel sections, said other sprocket wheelsection being driven by said films, and means-for focusing a line oflight on aportion of said film exposed through the space between saidsprocket sections with the rays of light substantially normal to thedirection of movement of the film at theexposed line;

in an overlying relation, means for driving oneof said sprocket wheelsections, said other sprocket wheel section being driven by said film,means for producing a line of light, rojectin means for bringing saidline of light to a ocus at the axis of and between said sprocket wheelsections and for exposing'a portion of said films with rays of lightfrom said line normal to said films.

6. An apparatus for printing from a nega tive soun record. to a positivecomp'rismg spaced coaxial sprocket wheel sections over which thenegatlve and positive move in an overlying relation, means for roducinga line of light, projecting means or bringing said line of light to afocus at the axis of and between said sprocket wheel'sections and for exosing-a portion of said films with rays of lig t from said linenormal tosaid films.

In witness whereof Ihave hereunto set my hand this 8th day of May, 1929.I

EARL I. SPONABLE.

3. An apparatus for printing -from a negative sound record to a positivecomprising two spaced coaxial sprocket wheel sections over which thenegatlve and positive move in an overlying re ation, means for drivingone of said sprocket wheel sections, said other sprocket wheel sectionbeing'driven by said film, means for producing a line of light, and

means for focusing said line of light on a portion of said films exposedthrough the space between said sprocket sections with the rays of lightsubstantially normal to the direction of movement of-the film at theexposed line.

4. An apparatus for printing from a negative sound record to a positivecomprising spaced coaxial sprocket wheel sections over which thenegativeand positive move in an overlying relation, means for producinga line of light, and means for focusing said line'of light on a portionof said films exposed -through the space between said sprocket sectionswith the rays'of light sub-

